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      <a href="/" style="font: 12px/14px arial,helvetica,sans-serif;">{:lang('Home')}</a>
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        <div class="layui-card-header">
            <h1>{:lang('Four-Point Contact Ball Bearings Design considerations')}</h1>
        </div>

        <!-- content -->
        <div class="Bearings-content">
            <div class="Bearings-specs">
                <div>
                    <div class="Bearings-specs-title">{:lang('Used as thrust bearing')}</div>
                    <div class="Bearings-specs-tip">{:lang('Four-point contact ball bearings are often used as entirely thrust bearings, together with a radial bearing. When used in this way, the four-point contact ball bearing should be mounted with radial clearance in the housing')} (<span class="flg" id="flg-1" src="{:Config::get('app.images_host')}/images/web/w_tcm_12-127796.jpg">fig. 1</span>)</div>
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                            <ul>
                                <li>{:lang('in combination with a cylindrical roller bearing:')}
                                    <ul>
                                        <li>{:lang('the radial internal clearance of the cylindrical roller bearing should be smaller than the theoretical radial internal clearance of the four-point contact ball bearing after both have been mounted')}</li>
                                        <li>{:lang('the theoretical radial clearance can be calculated from:')}
                                            <br/>C<sub>r</sub> = 0,7 C<sub>a</sub>
                                            <br/>{:lang('where')}
                                            <br/>C<sub>r</sub>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;{:lang('theoretical radial internal clearance')}
                                            <br/>C<sub>a</sub>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;{:lang('axial internal clearance')} (<span class="table_box" table="table1" tab-tt="table 1 - Axial internal clearance of four-point contact ball bearings">{:lang('table')} 1</span>)
                                            </li>
                                        <li>{:lang('the outer ring of the four-point contact ball bearing must be able to accommodate thermal movements')}
                                            <br/>{:lang('Therefore, it should not be clamped axially, but a small gap should be maintained between the outer ring and the cover flange.')}</li>
                                        <li>{:lang('bearings with locating slots should be used')} (<span class="flg" id="flg-1" src="{:Config::get('app.images_host')}/images/web/w_tcm_12-127796.jpg">fig. 1</span>) {:lang('to prevent the outer ring from turning')}
                                            <br/>{:lang('If clamping the outer ring cannot be avoided, the outer ring must be carefully centred during mounting.')}</li>
                                    </ul></li>
                                
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                        </div>
                    </div>
                </div>

                <div>
                    <div class="Bearings-specs-title">{:lang('Load ratio')}</div>
                    <div class="Bearings-specs-tip">{:lang('For proper functionality, the balls should contact only one inner ring raceway and the opposite side of the outer ring raceway. This is the case when the load ratio is:')}</div>
                    <div  class="Bearings-specs-box">
                        <div>
                            <ul>
                                <li>F<sub>a</sub>/F<sub>r</sub> ≥ 1,27 {:lang('for bearings in the QJ 2, QJ 3 and QJ 10 series')}</li>
                                <li>F<sub>a</sub>/F<sub>r</sub> ≥ 1,78 {:lang('for bearings in the QJ 12 series')}</li>
                            </ul>
                        </div>
                    </div>
                    <div class="Bearings-specs-tip">{:lang('A load ratio that is smaller than recommended can reduce bearing service life.')}</div>
                </div>
            </div>
        </div>
    </div>
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                <td colspan="2"><strong>Bore diameter</strong></td>
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                <td valign="top"><br></td>
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